package com.wxd.reggie.controller;

import com.wxd.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 上传接口
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info("上传的数据{}", file);
        //1.获取原始文件名
        String originalFilename = file.getOriginalFilename();
        //2.字符串切割 获取后缀名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //3.使用UUID生成新的文件名 防止文件名重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;
        //4. 判断文件路径是否存在 不存在则进行创建
        File dir = new File(basePath);
        if (!dir.exists()) {
            // 目录不存在需要创建
            dir.mkdirs();
        }
        //5. 将临时文件转存到指定位置
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    /**
     * 下载
     */
    @GetMapping("/download")
    public void download(String name,HttpServletResponse response) {
        try {
            //1. 输入流 通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //2. 输出流 通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            //3. 进行文件的复制操作 一边读一边写
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
            //4. 关闭流资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
